attic wall mystery

[Marcjb]

Hi all,

Attachment 1 shows a plan with roof (5in12) and ceiling (3in12) planes built, framing removed. I'm asking about the area within the circle. I've left out an interior partition there that would be connected to the exterior wall to form the back wall of the closet, and attachment 2 shows the rendered image. Attachment 3 shows the same area after I build that interior wall. For some reason, CA v10 is showng the upper part as an exterior attic wall. Rather annoying. Any help greatly appreciated.

Marc